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ICD-10 diagnosis code

N11.1 Chronic obstructive pyelonephritis

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N11.1 is the ICD-10 code for Chronic obstructive pyelonephritis. It is a four-character subcategory of N11 (Chronic tubulo-interstitial nephritis), the most specific level in the WHO edition. It belongs to the block N10–N16 (Renal tubulo-interstitial diseases) in Chapter XIV, Diseases of the genitourinary system.

Code type
Subcategory (4 characters)
Chapter
XIV · N00–N99
Classification
WHO ICD-10, 2019 version

What N11.1 includes

Conditions and terms that are coded here.

  • Pyelonephritis (chronic) associated with:
    • anomaly of pelviureteric junction
    • anomaly of pyeloureteric junction
    • anomaly of ureter
    • kinking of pelviureteric junction
    • kinking of pyeloureteric junction
    • kinking of ureter
    • obstruction of pelviureteric junction
    • obstruction of pyeloureteric junction
    • obstruction of ureter
    • stricture of pelviureteric junction
    • stricture of pyeloureteric junction
    • stricture of ureter

What N11.1 excludes

Conditions that look similar but belong under another code.

  • calculous pyelonephritis N20.9
  • obstructive uropathy N13.-

N11.1 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

N11.1Kronisk obstruktiv pyelonefrit

NorwayICD-10-NO

N11.1Kronisk obstruktiv pyelonefritt

DenmarkICD-10-DK

DN111Kronisk obstruktiv pyelonefritis

  • DN111AKronisk pyelonefritis ved ureterovesikal stenose
  • DN111BKronisk pyelonefritis ved ureteropelvin stenose
FinlandICD-10-FI

N11.1Pitkäaikainen obstruktiivinen pyelonefriitti

GermanyICD-10-GM

N11.1Chronische obstruktive Pyelonephritis

FranceICD-10-FR

N11.1Pyélonéphrite obstructive chronique

NetherlandsICD-10-NL

N11.1chronische obstructieve-pyelonefritis

United StatesICD-10-CM

N11.1Chronic obstructive pyelonephritis

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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